From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 619F9C77B73 for ; Wed, 19 Apr 2023 13:34:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232427AbjDSNeG (ORCPT ); Wed, 19 Apr 2023 09:34:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232129AbjDSNeF (ORCPT ); Wed, 19 Apr 2023 09:34:05 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93E0416DCD; Wed, 19 Apr 2023 06:33:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Z7wk1+WmrpLynoJg1RNmwt+ebZZ6qkCFyyApOA/bZSg=; b=pbbaxCF5CqzOna10Z26iIQqoHa FMWUstUEg19L+jzS89Q8o3YvVhxwOz4GGnUkHfaO+6wUdHmKAyxyyJP0/G7UfxRY5WlGDXHqvBdZ2 e4HDWEncFWZv9twu1VoxyJxOI3YcZoVfGAanC9CgbRJ0mHy5yfJQMCjHu+p4/m40u6Ox/Q4qMOIi9 +YbTCMoImhIsqD7nFp7L/RxopBODKanckZ56PE9Lz2iIMNRCPv40nIInK0xKE8itAoxZqYrSN63Ti qL1Z8iR+yn2YmVWmByYciR2uXcT9Op5RSlv+zMRsIl8vAf+GY03YIUQZLgolA7liAXjfiCIWutABN k36YyyAA==; Received: from [2001:8b0:10b:5:7e08:a586:e17f:4e92] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pp7vc-00DHgo-Ts; Wed, 19 Apr 2023 13:32:57 +0000 Message-ID: Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup From: David Woodhouse To: Thomas Gleixner , Paul Menzel Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , "Guilherme G. Piccoli" , Piotr Gorski , Usama Arif , =?ISO-8859-1?Q?J=FCrgen_Gro=DF?= , Boris Ostrovsky , xen-devel@lists.xenproject.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E. J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Mark Rutland , Sabin Rapan Date: Wed, 19 Apr 2023 14:32:54 +0100 In-Reply-To: <877cu83v45.ffs@tglx> References: <20230414225551.858160935@linutronix.de> <8247ce4d-15b7-03b2-0c9b-74f8cd6cad50@molgen.mpg.de> <87wn2a4la5.ffs@tglx> <87ttxd4qxz.ffs@tglx> <87r0sh4m7a.ffs@tglx> <8592a301-9933-1cad-bd61-8d97e7c7493b@molgen.mpg.de> <87a5z443g2.ffs@tglx> <877cu83v45.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-X0h7NkHlm7AixhyIbeie" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-csky@vger.kernel.org --=-X0h7NkHlm7AixhyIbeie Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-04-19 at 14:38 +0200, Thomas Gleixner wrote: >=20 > I'm leaning towards disabling the CPUID lead 0x01 based discovery and be > done with it. Makes sense. The large machines where users really want the parallel startup all ought to have X2APIC and hence CPUID 0x0b. --=-X0h7NkHlm7AixhyIbeie Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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